| http://www.w3.org/ns/prov#value | - Alternatively, the electrically conductive element that is coupled to the RF energy source (for example, 111, 121, 131, 141, 151, 161 and 171) may be formed using shape-memory retaining material, such as Nitinol, which would permit the electrode to be fitted to specific preset geometries, such as the ostium of a pulmonary vein, such that the electrode is shaped to provide a desired contact pressur
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