| http://www.w3.org/ns/prov#value | - Preferably, the outer tubular element 20 of inner tubular member is longitudinally relatively flexible but diametrically relatively rigid and preferably formed from a material such as polyimide so that it does not significantly deform when inflation fluid is passed through annular passageway 22 between the inner and outer tubular elements of the inner tubular member 13.
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