US Patent 6881213 Device and method to expand treatment array

A medical device is provided and includes an elongated tube that has a longitudinal axis and an expandable member attached to the tube. The expandable member is expandable from a collapsed configuration to an expanded configuration. A plurality of electrodes is attached to the expandable member. The electrodes are used to emit energy. Each of the electrodes is arranged generally coaxially relative to the tube when the expandable member is in its collapsed and expanded configurations.