A medical system for electrical stimulation includes a first column of electrodes, a second column of electrodes, an expandable member disposed between first and second columns, and an expansion mechanism adapted to transmit an externally applied pressure to the expandable member. The pressure expands...http://www.google.com/patents/US20080172117?utm_source=gb-gplus-sharePatent US20080172117 - EXPANDABLE SYSTEMS FOR MEDICAL ELECTRICAL STIMULATION
