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Influence of test protocol in determining the blood response to model polymers
G P A Michanetzis1, Y F Missirlis, N P Rhodes
1Biomedical Engineering Laboratory, University of Patras, Greece.
Evaluating biomaterial hemocompatibility revealed significant test method variability. Simple, reliable assays effectively distinguish polymer blood responses, correlating with complex protocols for better hemocompatibility assessment.
Area of Science:
- Biomaterials Science
- Hemocompatibility Testing
- Polymer Science
Background:
- Assessing biomaterial hemocompatibility is crucial for medical device development.
- Standardized hemocompatibility testing across different centers remains a challenge.
- Variability in test protocols can lead to inconsistent material performance evaluations.
Purpose of the Study:
- To evaluate the hemocompatibility of three distinct polymers (EVA, PVC, PVC-PEO) using multi-center, multi-parametric analysis.
- To identify discrepancies in hemocompatibility testing protocols across different European centers.
- To rationalize observed differences and rank the efficacy, cost, and simplicity of various assays.
Main Methods:
- Multi-center evaluation involving four European centers assessing polymer response to blood contact.
- Utilized assays for platelet adhesion, activation, aggregability, coagulation system activation, and ex vivo patency.
- Employed center-specific protocols for evaluating ethylenevinylacetate (EVA), polyvinylchloride (PVC), and PVC modified with polyethylene oxide (PVC-PEO).
Main Results:
- Some assays failed to differentiate between the tested polymers.
- Effective assays ranked polymers by hemocompatibility: EVA (most undesirable), PVC, PVC-PEO (most desirable).
- A correlation analysis indicated the predictive capability of different hemocompatibility tests.
Conclusions:
- Many current hemocompatibility assays are inappropriate for reliable biomaterial assessment.
- Simple, reliable test methods are available and demonstrate good correlation with sophisticated protocols.
- Standardized, effective hemocompatibility testing is essential for accurate biomaterial selection and development.
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