| http://www.w3.org/ns/prov#value | - For example, mesh structures, similar to those used for stents or other endoprostheses, may be appropriate for use as a housing 12 in accordance with the present invention, such as that shown in FIGS. 6A and 6B. The housing 12 may be tapered, as shown, in order to facilitate implantation of the apparatus 10 within a tapered branch between a main passage and first and second branches, as shown in F
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