Electrode assemblies and associated systems employ a nonporous wall having an exterior for contacting tissue. The exterior peripherally surrounds an interior area. The wall is essentially free of electrically conductive material. The wall is adapted to assume an expanded geometry having a first maximum...http://www.google.se/patents/US6428536?utm_source=gb-gplus-sharePatent US6428536 - Expandable-collapsible electrode structures made of electrically conductive material
