Patent ID: 7524318

Claim:
An ablation device, comprising: a cannula having a distal tip and a lumen extending within the cannula and terminating in an opening at the distal tip; a first array of electrodes at least partially disposed within the lumen and deployable from the distal tip opening, the first array of electrodes slidable relative to the cannula, the first array of electrodes having a first configuration when inside the lumen, and a second configuration when fully deployed outside the lumen; a second array of electrodes at least partially disposed within the lumen and deployable from the lumen at a point of the cannula proximal to the distal tip opening, the second array of electrodes slidable relative to the cannula, the second array of electrodes having first configuration when inside the lumen, and a second configuration when fully deployed outside the lumen, wherein a distal portion of every one of the electrodes of the second array has a curvilinear body, the electrodes of the second array deploy from the cannula in a proximal direction, and a distal tip of the body of every one of the electrodes of the second array does not point in the distal direction when the second array of electrodes is in the second configuration; wherein a distal portion of every one of the electrodes of the first array has a curvilinear body, and a distal tip of the body of every one of the electrodes of the first array does not point in a proximal direction relative to the cannula when the first array of electrodes is in the second configuration and wherein the first and the second arrays of electrodes face towards opposite directions when the arrays are outside the lumen of the cannula.