| http://www.w3.org/ns/prov#value | - The tube 52 may be formed from any of a variety of suitable materials, such as nylon, polyether block polyamide, PTFE, polyimide, teflon and other materials known to those skilled in the art, giving due consideration to the goals of non-reactivity to anatomical systems, flexibility, light-weight, strength, smoothness, and safety.
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