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Ammonia RF-Plasma Treatment of Tubular ePTFE Vascular Prostheses

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Plasmas and Polymers

Abstract

A cylindrically-configured plasma treatment system in Radio Frequency Glow Discharges fed with ammonia was used to modify the internal surface of ePTFE arterial prostheses. The effects of RF power, NH3 pressure, and treatment time on the surface chemical composition were characterized by XPS. The effect of moving the prosthesis within the plasma on the homogeneity of the surface treatment was also investigated. XPS studies were conducted in order to investigate the evolution of the treated surface during storage in atmosphere or water. Results show that the treatment at 20 W, for 250 seconds and under an ammonia pressure of 300 mTorr yielded a good compromise between ablation and substitution phenomena on the surface. With this treatment, fluorine content was decreased, while up to 11.6% of the surface atoms were substituted by nitrogen. Atmospheric storage up to 80 days shows a remodeling and oxidation of the surface by introducing up to 14.5% of oxygen. Finally, immersion in water for up to 7 hours showed a rapid defluorination of the treated surface.

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Authors and Affiliations

  1. Institut des Biomatériaux du Québec, Hôpital St-François d'Assise, Centre Hosptalier, Universitaire de Québec, 10, rue de, l'Espinay, Québec, G1L 3L5, Canada

    D. Mantovani, M. Castonguay, J. F. Pageau & G. Laroche

  2. Department of Metallurgy, Laval University, Quebec City, Quebec, Canada

    D. Mantovani & M. Fiset

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  1. D. Mantovani
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  2. M. Castonguay
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  3. J. F. Pageau
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  4. M. Fiset
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  5. G. Laroche
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Correspondence to G. Laroche.

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Mantovani, D., Castonguay, M., Pageau, J.F. et al. Ammonia RF-Plasma Treatment of Tubular ePTFE Vascular Prostheses. Plasmas and Polymers 4, 207–228 (1999). https://doi.org/10.1023/A:1021805110689

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