| http://www.w3.org/ns/prov#value | - As shown in FIGS. 3 and 4, after creating openings 80, 82 with a tool such as needle 78, the physician withdraws catheter 62 from the fistula site, leaving wire 178 in place, and a balloon 92 may be inserted over wire 178 and through openings 80, 82 and inflated to enlarge the openings.
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