| http://www.w3.org/ns/prov#value | - Property improving means in the form of gas contained in a multiplicity of cavities 26 are formed in the base material to improve the flexibility of the tubing 50. [0037]FIG. 9 shows a cross-section of a tubular composite structure of an embodiment of the invention, in which the self-supporting base material 52 is made of a polymer material suited for implantation, for example silicone or polyuret
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