Barrier properties of carbon films deposited on polymer-based devices in aggressive environments

The physical and chemical properties of diamond-like carbon (DLC) and carbyne-containing films on different substances, in particular on plastic materials, are advantageous for a great number of novel applications. These coatings, which possess the necessary mechanical characteristics of high adhesion to the plastic substrate material, chemical inertness and biocompatibility, have been proved to be hypoallergenic. In present paper, we report on the use of DLC and carbyne-containing films, formed by different ion-assisted methods, for strengthening and protecting of the surface of polymer-based medical products and for providing new functional properties. The medical products examined are: probes of different type, catheters, drainage tubes, polymer contact lenses and contact lens cases. It is shown that the DLC and carbyne-containing films are biocompatible, possess high chemical inertness to biological media of the human body, and provide the necessary rigidity to products. Antibacterial activity, a wide range of contact wetting angle changes, and a wide range of optical and colour characteristics open unlimited possibilities for the improvement of medical wares. Results on the mechanical properties of probes and contact lenses coated by carbon films, both from in vitro and clinical testing, are also presented.