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Fabrication and Characterization of Grafted Hydrogel Coatings Prepared by Active-Hydrogen Techniques for Vascular Devices

机译:活性氢技术制备的血管装置水凝胶涂层的制备与表征

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The problem of making the surfaces of plastics used for vascular implants compatible with blood was approached by coating them with hydrogels by the atomic-hydrogen grafting method. Early demonstrations of the method showed that the coatings, in some tests, could have minimal platelet and protein deposition and thrombogenesis. The earlier tests from in-vivo, ex-vivo, and in-vitro tests were later confirmed for polypropylene films coated with polyacrylamide. Fibrinogen and Factor XII were adsorbed to the hydrogel without loss of antigenic sites; in-vivo patency is prolonged in the vena-cava ring test, although not in every sample; no acute or sub-acute toxic effects could be demonstrated. It appears that the benign interactions between polyacrylamide and blood, as a material property of the hydrogel, do not entirely compensate for effects of surface texture, which perturb laminar blood flow.

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